Ren Jie, Guo Wenbin, Han Fuzhou, Wang Qichen, Cao Yi, Li Songbin, Li Geping, Ali Muhammad, Hu Jianan, Yuan Fusen, Zhang Yingdong
School of Materials Science and Engineering, University of Science and Technology of China, 96 JinZhai Road, Baohe District, Hefei, Anhui 230026, People's Republic of China.
Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, People's Republic of China.
Phys Chem Chem Phys. 2023 Dec 6;25(47):32578-32583. doi: 10.1039/d3cp04846b.
Twin boundaries provide a strong phonon scattering center to hinder the lattice thermal conductivity in thermoelectric materials, but the underlying evolution process of deformation twinning remains to be figured out. By applying atomic resolution transmission electron microscope (TEM) observations, a novel type of transitional structure of {0001} twin was observed, for the first time, in the p-type (Bi,Sb)Te alloy subjected to three-point bending deformation. The transformation from matrix to (0001) twin can be realized by the following path: matrix → transitional twin → (0001) twin, and this process was completed by the gliding of a total of four partial dislocations (b1 = 1/3[011̄0]) extended in the different (0001) planes. This new finding here will shed light on the nucleation and growth of deformation twins in the p-type (Bi, Sb)Te alloy.
孪晶界为热电材料中的晶格热导率提供了一个强大的声子散射中心，阻碍了其热导率，但变形孪晶的潜在演化过程仍有待弄清楚。通过应用原子分辨率透射电子显微镜（TEM）观察，首次在经受三点弯曲变形的p型（Bi，Sb）Te合金中观察到一种新型的{0001}孪晶过渡结构。从基体到（0001）孪晶的转变可以通过以下路径实现：基体→过渡孪晶→（0001）孪晶，并且这个过程是通过在不同（0001）平面中扩展的总共四个部分位错（b1 = 1/3[011̄0]）的滑移完成的。此处的这一新发现将为p型（Bi，Sb）Te合金中变形孪晶的形核和生长提供线索。
